This is a system used to keep the users (who use UniUploader) addons, logos, and settings updated.
When you upload an addon to this system, and hit "update" in UU, UU will look up the "Synchronization URL" (the one in the frame on the left)
UU will then proceed to download any update(s) that are in any way different than the copy stored on the user's hard drive, UU will replace the addon with the new copy of the addon from this system.